My prego Golden is on day 70 with F1's!! Whats the latest you've had pups whelp? I'm nervous!

My golden retriever is on day 70 with F1 goldendoodles and hasn't delivered. She's huge and digging a lot, but still nothing. I've been breeding dogs for years and never had one go this long! She doesn't seem to be in distress or anything. The vet says she's fine, that they can go as late as day 72 but I've never heard that! Her breeding was Artificial Insemination and we count the first breeding as day 1. Any suggestions from other breeders?

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There are lots of breeder groups online, where you would find people more equipped to answer your questions.